BEAVERTON -- Robert Ross Myers called 9-1-1 shortly before midnight Wednesday, reporting his infant son, Aden, was not breathing at their Beaverton apartment. When police arrived, the 26-year-old reportedly told them he was asleep on the couch with the 7-week-old, when he rolled over, suffocating the baby.

But as the investigation continued, detectives learned Aden's injuries were not consistent with what Myers said occurred, and he is accused of murder in the death.

"I can tell you from all indications that the initial account does not hold water anymore," said Beaverton Police Chief Geoff Spalding during a press conference held Friday afternoon. "Initially, the version appeared to be somewhat plausible."

While Aden was receiving treatment at the hospital, doctors reportedly found the baby had a broken chest bone that appeared to be healing. The injury, Spalding said, was not in line with Myers' story.

Aden was taken off of life support Thursday evening and pronounced dead, Beaverton police said. Detectives again interviewed Myers, and they determined Aden's injuries were not the result of an accident. Myers was arrested and lodged in the Washington County Jail, where he remains without bail.

Circuit Judge Janelle Wipper presided over Myers' arraignment Friday afternoon. Myers, wearing a lime green jail jumpsuit, appeared behind a glass window looking into the courtroom, where he was charged with one count of murder.

Spalding said an autopsy is scheduled for Saturday afternoon to determine Aden's cause of death and whether he had other signs of abuse. It is possible that Aden was shook, he said.

"The most important factor ... was the fact that it was a bone that was in the stages of healing," Spalding said. "It wasn't something that just happened (Wednesday night)."

Prior to his update on the investigation, Spalding offered condolences to the family.

The child's mother and Myers' girlfriend, Stephanie Baker, 27, was home when the incident occurred but was in another room, Spalding said. She and Myers both work at the Beaverton Fred Meyer store on Southwest Walker Road and live together at the apartment. Baker has been cooperative with investigators.

Spalding was not aware of a history of domestic abuse between Myers and Baker. Court records indicate that Myers does not have a criminal history in Oregon.

Daniel Myers said the family doesn't know exactly what happened to the baby. His son was trying to help Baker and was stressed, he said.

"He was just trying to give her rest," Daniel Myers said.

He has spoken with his son by phone since the arrest, Daniel Myers said.

"He's taken responsibility for this," he said. "He's broken up. ... He asked me to take care of his fiancee."

Daniel Myers commended the Beaverton police for their handling of the case and his son's honesty.

"Bless his soul, he told the truth," he said.

People inside the couple's home Friday morning declined to comment.

Sonja Muchen, 29, who lives below the couple, said she saw police cars and an ambulance with a stretcher outside the apartments Wednesday night. She wasn't sure what happened but saw a woman crying and talking with police. Muchen didn't know the woman by name but said she lives at the apartment with a man and child. The couple already lived there when Muchen moved into the complex in July.